package main

import "fmt"

func main() {
	arr1 := [][]int{
		[]int{111,222,333},
		[]int{777,888,999},
	}
	arr1 = append(arr1, []int{})
	copy(arr1[2:],arr1[1:])
	arr1[1] = []int{444,555,666}
	fmt.Println(arr1)
	//arr2=append(arr2[:0],arr1[1:])
	//fmt.Println(arr2)

}
